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The Blackwood Group System: its relevance for sustainable forest management in the southern Cape
Item type: Journal Article • Journal: South African Forestry Journal • Authors: CoertJ. Geldenhuys --- Division of Water, Environment and Forestry Technology, Southern AfricaThe invasion status of Australian blackwood, Acacia melanoxylon, is assessed against its value as a commercial tree in the southern Cape forests. The species was introduced from Australian rain forests and planted extensively in the southern Cape forests since 1909... -
Effect of continuous grazing in the dohne sourveld on species composition and basal cover
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.F. du Toit --- , A.J. Aucamp --- ,In a grazing trial conducted at the Dohne Agricultural Research Station, natural grassland was grazed continuously for 36 years with cattle. In a second investigation conducted on similar grassland, paddocks were grazed or rested, in all combinations of the four... -
Identification and selection of benchmark sites on litholitic soils of the western grassland biome of South Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: O.J.H. Bosch --- Department Botany, F.P. Janse van Rensburg --- Department Botany, S. du T. Truter --- Department Botany,An approach to identify benchmarks for different ecological situations in the grassland biome is described. The approach is illustrated by using information on vegetation change, role of habitat factors and the relative palatability differences between the species of the vegetation... -
Ecological status of species on grazing gradients on the shallow soils of the western grassland biome in South Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: O.J.H. Bosch --- Department Botany, F.P. Janse vanRensburg --- Department Botany,Grasses on the shallow soils of the western grassland biome of South Africa were classified on their ecological status on the basis of their reaction to grazing. Vegetation data were gathered in such a way that those of different successional... -
Die invloed van bemesting op die spesiesamestelling en basale bedekking van beweide veld in die Potchefstroom‐omgewing
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: FranciP. Janse van Rensburg --- Departement Landbou en Watervoorsiening, Republiek van Suid‐Afrika R.H. Drewes --- Departement Landbou en Watervoorsiening, Republiek van Suid‐Afrika J.W. Cilliers --- Departement Landbou en Watervoorsiening, Republiek van Suid‐Afrika A.C. Beckerling --- Departement Landbou en Watervoorsiening, Republiek van Suid‐AfrikaThe impact of fertilization on veld in the Potchefstroom area was investigated. Nitrogen and phosphorus were applied annually from 1972/73 until 1981/82. The control plots and the fertilized plots were grazed with year‐old steers. Species composition and basal cover were... -
A CONCEPTUAL MODEL OF A SILTATION SYSTEM IN SHALLOW LAKES WITH LITTORAL VEGETATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.J. Weisser --- Facultad de Ciencias,In shallow lakes a siltation system develops when wind driven water turbulence erodes the lake floor, silt is resuspended and transported by means of waterdrift into the littoral vegetation. Here, due to the resistance of the vegetation, the turbulence is... -
ASPECTS OF COMPARATIVE PLANKTON ECOLOGY IN CASCADING MGENI RIVER RESERVOIRS (MIDMAR, ALBERT FALLS, AND NAGLE): AN OVERVIEW
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R.C. Hart --- Department of Zoology & Entomology, South AfricaAn overview of a three year study of abundance, community structure and succession of zooplankton and phytoplankton in relation to physical limnological conditions in Lakes Midmar and Albert Falls is presented, along with findings on zooplankton from a nine month... -
A contiguous-quadrat sampling exercise in a shrub-invaded grassland patch: size matters but biggest is not best
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J Goodall P Zacharias T Olckers T EdwardsWe attempted to ascertain the most effective sample size for monitoring serial changes in the herbaceous layer of fragmented and neglected grasslands that are responding to annual veld burning. We conducted a sampling exercise in a coastal grassland invaded by... -
Habitat selection by large herbivores in relation to fire at the Bontebok National Park (1974–2009): the effects of management changes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T Kraaij --- Scientific Services, South Africa PA Novellie --- Conservation Services Division, PretoriaThe Bontebok National Park has long been faced with the dilemma of reconciling the need for short-interval fires, which promote grazing for bontebok, with that for longer-interval fires to maintain plant diversity. We explored habitat selection by various large herbivores... -
The proposed colonisation sequence of woody species in the Sourish Mixed Bushveld of the Limpopo province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JJ Jordaan --- , South AfricaThe long-term establishment sequence of the woody component of the Sourish Mixed Bushveld of the Limpopo province was studied and documented. Vegetation surveys were conducted at a protected site at the Towoomba Agricultural Development Centre during 1977 and 2000. Over... -
The influence of tree thinning on the establishment of herbaceous plants in a semi-arid savanna of southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G.N. Smit F.G. RethmanThe investigation was conducted on an area covered by a dense stand of Colophospermum mopane. Seven plots (65 m × 180 m) were subjected to different intensities of tree thinning, ranging from a totaly cleared plot (0%) to plots thinned... -
Fire and Senescent Fynbos in the Swartberg, Southern Cape
Item type: Journal Article • Journal: South African Forestry Journal • Authors: W. Bond --- ,Some consequences of long intervals between fires were studied in fynbos of the Swartberg Mountains. Results showed that foliage projective cover was less patchy and mostly denser in mature than in senescent regrowth. Proteaceae seedling regeneration was significantly reduced in... -
Effects of long-term exclusion of the limpet Cymbula oculus (Born) on the distribution of intertidal organisms on a rocky shore
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GW Maneveldt --- Department of Biodiversity and Conservation Biology, South Africa RC Eager --- Department of Biodiversity and Conservation Biology, South Africa A Bassier --- Department of Biodiversity and Conservation Biology, South AfricaZonation patterns on rocky shores are typically as a result of both physical factors and biological interactions. Physical factors generally set the upper limits of species distributions whereas biological interactions generally set their lower limits. However, recent research has shown... -
Can δ15N and δ13C stable isotopes and fatty acid signatures indicate changes in phytobenthos composition on an artificial substrate?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dalu --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaTemporal changes in fatty acid composition and δ15N, δ13C stable isotope values of the phytobenthos growing on artificial clay substrates under natural conditions over a 28-day period at an upstream and a downstream site in the Kowie River near Grahamstown... -
A case of natural queen succession in a captive colony of naked mole-rats, Heterocephalus glaber
Item type: Journal Article • Journal: African Zoology • Authors: L. A. van der Westhuizen --- Department of Zoology, South Africa J. U. M. Jarvis --- Department of Zoology, South Africa N. C. Bennett --- Department of Zoology & Entomology, South AfricaNaked mole-rats occur in large colonies where usually a single queen monopolizes reproduction. Queen succession occurs from within usually as a result of aggressive encounters with subordinate females that queue for reproductive succession following colony instability, which inevitably results in... -
Succession to traditional Venda leadership in a changing constitutional environment in South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: FC de Beer --- Department of Anthropology and Archaeology,The conflict and ambivalence in the legislative transformation in South Africa, recognising on the one hand the institution of traditional leadership and its concomitant customs and values, and on the other hand enforcing the fundamental value of gender equality entrenched... -
Succession to Bogosi among the Batlhako ba Matutu in a changing dispensation
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: RD Coertze --- School of Law, University of South Africa, FC de Beer --- Department of Anthropology and Archaeology,Dealing with a succession dispute among the Batlhako ba Matutu required a study of their politico-administrative structure, their marriage rules and procedures, as well as the genealogical succession of their senior traditional leaders since 1830. Research findings disclosed traditional rules... -
The Constitutional right to culture and the judicial development of Indigenous Law: a comparative analysis of cases
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Joan Church --- Department of Jurisprudence, Jacqueline Church --- Department of Procedural Law, Faculty of Law,Although integral to the culture of indigenous peoples in South Africa, indigenous law was historically only recognised as a personal law subservient to the general law. This is no longer so. In the Constitution of the Republic of South Africa,... -
Good or bad, my heritage: customary legal practices and the liberal constitution of postcolonial states
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Thomas Widlok --- Max Planck Institute for Psycholinguistics, NetherlandsThe post-colonial constitutions of Namibia (1990) and of South Africa (1996) in principle allow for ‘indigenous’ or ‘customary’ law within the framework set by constitutional law. Developments in recent years, in particular in the course of debates surrounding the reform... -
The effects of fire-breaks on plant diversity and species composition in the grasslands of the Loskop Dam Nature Reserve, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Laura M Bachinger --- Department of Plant Science, South Africa Leslie R Brown --- Applied Behavioural Ecology and Ecosystem Research Unit, Department of Environmental Sciences, South Africa Margaretha W van Rooyen --- Department of Plant Science, South AfricaThere is a dearth of knowledge on the effects of annual burning of fire-breaks on species composition, plant diversity and soil properties. Whittaker's plant diversity technique was used to gather data on species composition and diversity in four grassland communities... -
Restoration of degraded ecosystems in the Afromontane highlands of Ethiopia: comparison of plantations and natural regeneration
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Abrham Abiyu --- Amhara Agricultural Research Institute, Ethiopia Demel Teketay --- Department of Crop Science and Production, Botswana Gerhard Glatzel --- Institute of Forest Ecology, University of Natural Resources and Life Sciences, Austria Raf Aerts --- Ecology, Evolution and Biodiversity Conservation Section, Belgium Georg Gratzer --- Institute of Forest Ecology, University of Natural Resources and Life Sciences, AustriaThe scale of deforestation in sub-Saharan Africa underscores the need for forest restoration. Information is scarce for evidence-based restoration options. Sown Senna didymobotrya, planted Ficus thonningii cuttings, sown S. didymobotrya and planted F. thonningii combined, and previously occurring native non-browse... -
Temperate forest dynamics and carbon storage: a 26-year case study from Orange Kloof Forest, Cape Peninsula, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Anabelle W Cardoso --- Department of Biological Sciences, South Africa Jeremy J Midgley --- Department of Biological Sciences, South Africa M Timm Hoffman --- Department of Biological Sciences, South Africa Coert J Geldenhuys --- Department of Forest and Wood Science, South AfricaTemperate forests are globally important carbon stores that are, in the face of recent improvements in their conservation, likely to increase their storage capacity in the future. Despite this, these ecosystems are poorly understood, especially over longer time periods. To... -
Triggers of phytoplankton bloom dynamics in permanently eutrophic waters of a South African estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Lemley --- Botany Department and the Institute for Coastal and Marine Research, South Africa JB Adams --- Botany Department and the Institute for Coastal and Marine Research, South Africa NA Strydom --- Zoology Department, South AfricaThe permanently eutrophic Sundays Estuary experiences recurrent harmful algal blooms (HABs) of Heterosigma akashiwo (Raphidophyceae). This study aimed to identify the environmental variables shaping phytoplankton community composition and succession patterns during a typical spring/summer harmful algal bloom (HAB) period. Monitoring... -
Height growth strategies of Mimosa scabrella along a chronosequence
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vinicius Costa Cysneiros --- Federal University of Paraná, Brazil Sebastião do Amaral Machado --- Federal University of Paraná, Brazil Allan Libanio Pelissari --- Federal University of Paraná, Brazil Edilson Urbano --- State University of Mato Grosso do Sul, Aquidauana University Unit, BrazilAssessing variations in tree allometry is useful for understanding height growth strategies in relation to life-history trajectories, light competition and environmental restrictions. Scaling exponent and asymptotic heights obtained from height–diameter (HD) models may elucidate how trees optimise growth strategies and... -
Do native grasses emerge and establish in areas rehabilitated using vetiver grass?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Lindokuhle X Dlamini --- University of KwaZulu-Natal, South Africa Michelle J Tedder --- University of KwaZulu-Natal, South Africa Kevin P Kirkman --- University of KwaZulu-Natal, South AfricaSpecies-rich grasslands provide important ecosystem services, and in South Africa, approximately 40% of these grasslands are degraded. Vetiver grass (from India) is often used during rehabilitation efforts to restore soil function without a thorough understanding of the potential negative ecological...